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        <li><a href="#注册中间件">注册中间件</a></li>
        <li><a href="#中间件注意事项">中间件注意事项</a></li>
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    </li>
    <li><a href="#运行多个服务">运行多个服务</a></li>
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    <article class="post">
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            <h1 class="post-title">中间件</h1>
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        <date class="post-meta meta-date">
            2021年9月5日
        </date>
        
        <div class="post-meta">
            <span>|</span>
            
            <span class="meta-category"><a href='/categories/go'>go</a></span>
            
            <span class="meta-category"><a href='/categories/gin'>gin</a></span>
            
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        <div class="post-meta">
            <span id="busuanzi_container_page_pv">|<span id="busuanzi_value_page_pv"></span><span>
                    阅读</span></span>
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        <div class="post-content">
            <p>个人建议：</p>
<p><a href="https://juejin.im/post/6844903833164857358">gin 中间件</a></p>
<p>代码：</p>
<pre><code>package main

import (
	&quot;fmt&quot;
	&quot;github.com/gin-gonic/gin&quot;
	&quot;net/http&quot;
	&quot;time&quot;
)
//HandlerFunc
func indexHandler (c *gin.Context) {
	fmt.Println(&quot;index,,,&quot;)
	c.JSON(http.StatusOK,gin.H{
		&quot;msg&quot;:&quot;index&quot;,
	})

}
//定义一个中间件m1  一个统计耗时请求耗时的中间件
func m1(c *gin.Context ){
	fmt.Println(&quot;m1 in ...&quot;)
	//计时
	start :=time.Now()
	c.Next()//调用后续的处理函数
	//c.Abort()//阻止调用后续的处理函数
	cost:=time.Since(start)
	// 计算耗时
	fmt.Printf(&quot;cost:%v\n&quot; ,cost)

	fmt.Println(&quot;m1 out ...&quot;)



}
func main()  {
	r:= gin.Default()
	//func (engine *Engine) Use(middleware ...HandlerFunc) IRoutes {
	//	engine.RouterGroup.Use(middleware...)
	//	engine.rebuild404Handlers()
	//	engine.rebuild405Handlers()
	//	return engine
	//}
	r.Use(m1)//全局注册中间件函数
//GET(relativePath string, handlers ...HandlerFunc)
	r.GET(&quot;/index&quot;,indexHandler)
	r.GET(&quot;/shop&quot;, func(c *gin.Context) {
		c.JSON(http.StatusOK,gin.H{
			&quot;msg&quot;:&quot;shop&quot;,
		})
		
	})
	r.GET(&quot;/user&quot;,m1, func(c *gin.Context) {
		c.JSON(http.StatusOK,gin.H{
			&quot;msg&quot;:&quot;user&quot;,
		})

	})
	r.Run(&quot;:5555&quot;)

}

</code></pre><p>定义</p>
<pre><code>//定义一个中间件m1  一个统计耗时请求耗时的中间件
func m1(c *gin.Context) {
	fmt.Println(&quot;m1 in ...&quot;)
	//计时
	start := time.Now()
	c.Next() //调用后续的处理函数
	//c.Abort()//阻止调用后续的处理函数
	cost := time.Since(start)
	// 计算耗时
	fmt.Printf(&quot;cost:%v\n&quot;, cost)

	fmt.Println(&quot;m1 out ...&quot;)

}
</code></pre><p>接下来分析</p>
<pre><code>package main

import (
	&quot;fmt&quot;
	&quot;github.com/gin-gonic/gin&quot;
	&quot;net/http&quot;
	&quot;time&quot;
)

//HandlerFunc
func indexHandler(c *gin.Context) {
	fmt.Println(&quot;index,,,&quot;)
	c.JSON(http.StatusOK, gin.H{
		&quot;msg&quot;: &quot;index&quot;,
	})

}

//定义一个中间件m1  一个统计耗时请求耗时的中间件
func m1(c *gin.Context) {
	fmt.Println(&quot;m1 in ...&quot;)
	//计时
	start := time.Now()
	c.Next() //调用后续的处理函数
	//c.Abort()//阻止调用后续的处理函数
	cost := time.Since(start)
	// 计算耗时
	fmt.Printf(&quot;cost:%v\n&quot;, cost)
	fmt.Println(&quot;m1 out ...&quot;)

}
//定义一个中间件m2  一个统计耗时请求耗时的中间件
func m2(c *gin.Context) {
	fmt.Println(&quot;m2 in ...&quot;)
	c.Next() //调用后续的处理函数
	fmt.Println(&quot;m2 out ...&quot;)

}
func main() {
	r := gin.Default()
	//func (engine *Engine) Use(middleware ...HandlerFunc) IRoutes {
	//	engine.RouterGroup.Use(middleware...)
	//	engine.rebuild404Handlers()
	//	engine.rebuild405Handlers()
	//	return engine
	//}
	r.Use(m1,m2) //全局注册中间件函数m1,m2
	//GET(relativePath string, handlers ...HandlerFunc)
	r.GET(&quot;/index&quot;, indexHandler)
	r.GET(&quot;/shop&quot;, func(c *gin.Context) {
		c.JSON(http.StatusOK, gin.H{
			&quot;msg&quot;: &quot;shop&quot;,
		})

	})
	r.GET(&quot;/user&quot;, m1, func(c *gin.Context) {
		c.JSON(http.StatusOK, gin.H{
			&quot;msg&quot;: &quot;user&quot;,
		})

	})
	r.Run(&quot;:5555&quot;)

}

</code></pre><p>
        <a data-fancybox="gallery" href="https://mxszs.oss-cn-beijing.aliyuncs.com/img/image-20200814135122855.png">
            <img class="mx-auto" alt="image-20200814135122855" src="https://mxszs.oss-cn-beijing.aliyuncs.com/img/image-20200814135122855.png" />
        </a>
    </p>
<p>或者</p>
<p>
        <a data-fancybox="gallery" href="https://mxszs.oss-cn-beijing.aliyuncs.com/img/image-20200814135218074.png">
            <img class="mx-auto" alt="image-20200814135218074" src="https://mxszs.oss-cn-beijing.aliyuncs.com/img/image-20200814135218074.png" />
        </a>
    </p>
<p>简单画出步骤就是</p>
<p>
        <a data-fancybox="gallery" href="https://mxszs.oss-cn-beijing.aliyuncs.com/img/image-20200814135346805.png">
            <img class="mx-auto" alt="image-20200814135346805" src="https://mxszs.oss-cn-beijing.aliyuncs.com/img/image-20200814135346805.png" />
        </a>
    </p>
<p>当m2中</p>
<pre><code>c.Next() //调用后续的处理函数
切换为
c.About()//阻止后续的处理函数

</code></pre><p>
        <a data-fancybox="gallery" href="https://mxszs.oss-cn-beijing.aliyuncs.com/img/image-20200814135946227.png">
            <img class="mx-auto" alt="image-20200814135946227" src="https://mxszs.oss-cn-beijing.aliyuncs.com/img/image-20200814135946227.png" />
        </a>
    </p>
<p>现在再添加</p>
<pre><code>//定义一个中间件m1  一个统计耗时请求耗时的中间件
func m2(c *gin.Context) {
	fmt.Println(&quot;m2 in ...&quot;)
	c.Abort() //组织后续的处理函数
	return
	fmt.Println(&quot;m2 out ...&quot;)

}
</code></pre><p>
        <a data-fancybox="gallery" href="https://mxszs.oss-cn-beijing.aliyuncs.com/img/image-20200814140406124.png">
            <img class="mx-auto" alt="image-20200814140406124" src="https://mxszs.oss-cn-beijing.aliyuncs.com/img/image-20200814140406124.png" />
        </a>
    </p>
<p>中间件的真正使用：</p>
<pre><code>//doCheck bool开关
func authMiddleware(doCheck bool)gin.HandlerFunc{
   //利用到了闭包的使用
   //连接数据库
   //或者一些其他准备工作
   return func(c *gin.Context) {
      if doCheck{
         //存放具体的处理逻辑
         //是否登录的判断
         //if 是登录用户
         //c.next()
         //else
         //c.about()
      }else{
         c.Next()

      }
      
   }

}
</code></pre><h3 id="注册中间件">注册中间件</h3>
<p>在gin框架中，我们可以为每个路由添加任意数量的中间件。</p>
<h4 id="为全局路由注册">为全局路由注册</h4>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-go" data-lang="go"><span style="color:#66d9ef">func</span> <span style="color:#a6e22e">main</span>() {
	<span style="color:#75715e">// 新建一个没有任何默认中间件的路由
</span><span style="color:#75715e"></span>	<span style="color:#a6e22e">r</span> <span style="color:#f92672">:=</span> <span style="color:#a6e22e">gin</span>.<span style="color:#a6e22e">New</span>()
	<span style="color:#75715e">// 注册一个全局中间件
</span><span style="color:#75715e"></span>	<span style="color:#a6e22e">r</span>.<span style="color:#a6e22e">Use</span>(<span style="color:#a6e22e">StatCost</span>())
	
	<span style="color:#a6e22e">r</span>.<span style="color:#a6e22e">GET</span>(<span style="color:#e6db74">&#34;/test&#34;</span>, <span style="color:#66d9ef">func</span>(<span style="color:#a6e22e">c</span> <span style="color:#f92672">*</span><span style="color:#a6e22e">gin</span>.<span style="color:#a6e22e">Context</span>) {
		<span style="color:#a6e22e">name</span> <span style="color:#f92672">:=</span> <span style="color:#a6e22e">c</span>.<span style="color:#a6e22e">MustGet</span>(<span style="color:#e6db74">&#34;name&#34;</span>).(<span style="color:#66d9ef">string</span>) <span style="color:#75715e">// 从上下文取值
</span><span style="color:#75715e"></span>		<span style="color:#a6e22e">log</span>.<span style="color:#a6e22e">Println</span>(<span style="color:#a6e22e">name</span>)
		<span style="color:#a6e22e">c</span>.<span style="color:#a6e22e">JSON</span>(<span style="color:#a6e22e">http</span>.<span style="color:#a6e22e">StatusOK</span>, <span style="color:#a6e22e">gin</span>.<span style="color:#a6e22e">H</span>{
			<span style="color:#e6db74">&#34;message&#34;</span>: <span style="color:#e6db74">&#34;Hello world!&#34;</span>,
		})
	})
	<span style="color:#a6e22e">r</span>.<span style="color:#a6e22e">Run</span>()
}
</code></pre></div><h4 id="为某个路由单独注册">为某个路由单独注册</h4>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-go" data-lang="go"><span style="color:#75715e">// 给/test2路由单独注册中间件(可注册多个)
</span><span style="color:#75715e"></span>	<span style="color:#a6e22e">r</span>.<span style="color:#a6e22e">GET</span>(<span style="color:#e6db74">&#34;/test2&#34;</span>, <span style="color:#a6e22e">StatCost</span>(), <span style="color:#66d9ef">func</span>(<span style="color:#a6e22e">c</span> <span style="color:#f92672">*</span><span style="color:#a6e22e">gin</span>.<span style="color:#a6e22e">Context</span>) {
		<span style="color:#a6e22e">name</span> <span style="color:#f92672">:=</span> <span style="color:#a6e22e">c</span>.<span style="color:#a6e22e">MustGet</span>(<span style="color:#e6db74">&#34;name&#34;</span>).(<span style="color:#66d9ef">string</span>) <span style="color:#75715e">// 从上下文取值
</span><span style="color:#75715e"></span>		<span style="color:#a6e22e">log</span>.<span style="color:#a6e22e">Println</span>(<span style="color:#a6e22e">name</span>)
		<span style="color:#a6e22e">c</span>.<span style="color:#a6e22e">JSON</span>(<span style="color:#a6e22e">http</span>.<span style="color:#a6e22e">StatusOK</span>, <span style="color:#a6e22e">gin</span>.<span style="color:#a6e22e">H</span>{
			<span style="color:#e6db74">&#34;message&#34;</span>: <span style="color:#e6db74">&#34;Hello world!&#34;</span>,
		})
	})
</code></pre></div><h4 id="为路由组注册中间件">为路由组注册中间件</h4>
<p>为路由组注册中间件有以下两种写法。</p>
<p>写法1：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-go" data-lang="go"><span style="color:#a6e22e">shopGroup</span> <span style="color:#f92672">:=</span> <span style="color:#a6e22e">r</span>.<span style="color:#a6e22e">Group</span>(<span style="color:#e6db74">&#34;/shop&#34;</span>, <span style="color:#a6e22e">StatCost</span>())
{
    <span style="color:#a6e22e">shopGroup</span>.<span style="color:#a6e22e">GET</span>(<span style="color:#e6db74">&#34;/index&#34;</span>, <span style="color:#66d9ef">func</span>(<span style="color:#a6e22e">c</span> <span style="color:#f92672">*</span><span style="color:#a6e22e">gin</span>.<span style="color:#a6e22e">Context</span>) {<span style="color:#f92672">...</span>})
    <span style="color:#f92672">...</span>
}
</code></pre></div><p>写法2：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-go" data-lang="go"><span style="color:#a6e22e">shopGroup</span> <span style="color:#f92672">:=</span> <span style="color:#a6e22e">r</span>.<span style="color:#a6e22e">Group</span>(<span style="color:#e6db74">&#34;/shop&#34;</span>)
<span style="color:#a6e22e">shopGroup</span>.<span style="color:#a6e22e">Use</span>(<span style="color:#a6e22e">StatCost</span>())
{
    <span style="color:#a6e22e">shopGroup</span>.<span style="color:#a6e22e">GET</span>(<span style="color:#e6db74">&#34;/index&#34;</span>, <span style="color:#66d9ef">func</span>(<span style="color:#a6e22e">c</span> <span style="color:#f92672">*</span><span style="color:#a6e22e">gin</span>.<span style="color:#a6e22e">Context</span>) {<span style="color:#f92672">...</span>})
    <span style="color:#f92672">...</span>
}
</code></pre></div><h3 id="中间件注意事项">中间件注意事项</h3>
<h4 id="gin默认中间件">gin默认中间件</h4>
<p><code>gin.Default()</code>默认使用了<code>Logger</code>和<code>Recovery</code>中间件，其中：</p>
<ul>
<li><code>Logger</code>中间件将日志写入<code>gin.DefaultWriter</code>，即使配置了<code>GIN_MODE=release</code>。</li>
<li><code>Recovery</code>中间件会recover任何<code>panic</code>。如果有panic的话，会写入500响应码。</li>
</ul>
<p>如果不想使用上面两个默认的中间件，可以使用<code>gin.New()</code>新建一个没有任何默认中间件的路由。</p>
<h4 id="gin中间件中使用goroutine">gin中间件中使用goroutine</h4>
<p>当在中间件或<code>handler</code>中启动新的<code>goroutine</code>时，<strong>不能使用</strong>原始的上下文(c *gin.Context)，必须使用其只读副本(<code>c.Copy()</code>)。</p>
<h2 id="运行多个服务">运行多个服务</h2>
<p>我们可以在多个端口启动服务，例如：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-go" data-lang="go"><span style="color:#f92672">package</span> <span style="color:#a6e22e">main</span>

<span style="color:#f92672">import</span> (
	<span style="color:#e6db74">&#34;log&#34;</span>
	<span style="color:#e6db74">&#34;net/http&#34;</span>
	<span style="color:#e6db74">&#34;time&#34;</span>

	<span style="color:#e6db74">&#34;github.com/gin-gonic/gin&#34;</span>
	<span style="color:#e6db74">&#34;golang.org/x/sync/errgroup&#34;</span>
)

<span style="color:#66d9ef">var</span> (
	<span style="color:#a6e22e">g</span> <span style="color:#a6e22e">errgroup</span>.<span style="color:#a6e22e">Group</span>
)

<span style="color:#66d9ef">func</span> <span style="color:#a6e22e">router01</span>() <span style="color:#a6e22e">http</span>.<span style="color:#a6e22e">Handler</span> {
	<span style="color:#a6e22e">e</span> <span style="color:#f92672">:=</span> <span style="color:#a6e22e">gin</span>.<span style="color:#a6e22e">New</span>()
	<span style="color:#a6e22e">e</span>.<span style="color:#a6e22e">Use</span>(<span style="color:#a6e22e">gin</span>.<span style="color:#a6e22e">Recovery</span>())
	<span style="color:#a6e22e">e</span>.<span style="color:#a6e22e">GET</span>(<span style="color:#e6db74">&#34;/&#34;</span>, <span style="color:#66d9ef">func</span>(<span style="color:#a6e22e">c</span> <span style="color:#f92672">*</span><span style="color:#a6e22e">gin</span>.<span style="color:#a6e22e">Context</span>) {
		<span style="color:#a6e22e">c</span>.<span style="color:#a6e22e">JSON</span>(
			<span style="color:#a6e22e">http</span>.<span style="color:#a6e22e">StatusOK</span>,
			<span style="color:#a6e22e">gin</span>.<span style="color:#a6e22e">H</span>{
				<span style="color:#e6db74">&#34;code&#34;</span>:  <span style="color:#a6e22e">http</span>.<span style="color:#a6e22e">StatusOK</span>,
				<span style="color:#e6db74">&#34;error&#34;</span>: <span style="color:#e6db74">&#34;Welcome server 01&#34;</span>,
			},
		)
	})

	<span style="color:#66d9ef">return</span> <span style="color:#a6e22e">e</span>
}

<span style="color:#66d9ef">func</span> <span style="color:#a6e22e">router02</span>() <span style="color:#a6e22e">http</span>.<span style="color:#a6e22e">Handler</span> {
	<span style="color:#a6e22e">e</span> <span style="color:#f92672">:=</span> <span style="color:#a6e22e">gin</span>.<span style="color:#a6e22e">New</span>()
	<span style="color:#a6e22e">e</span>.<span style="color:#a6e22e">Use</span>(<span style="color:#a6e22e">gin</span>.<span style="color:#a6e22e">Recovery</span>())
	<span style="color:#a6e22e">e</span>.<span style="color:#a6e22e">GET</span>(<span style="color:#e6db74">&#34;/&#34;</span>, <span style="color:#66d9ef">func</span>(<span style="color:#a6e22e">c</span> <span style="color:#f92672">*</span><span style="color:#a6e22e">gin</span>.<span style="color:#a6e22e">Context</span>) {
		<span style="color:#a6e22e">c</span>.<span style="color:#a6e22e">JSON</span>(
			<span style="color:#a6e22e">http</span>.<span style="color:#a6e22e">StatusOK</span>,
			<span style="color:#a6e22e">gin</span>.<span style="color:#a6e22e">H</span>{
				<span style="color:#e6db74">&#34;code&#34;</span>:  <span style="color:#a6e22e">http</span>.<span style="color:#a6e22e">StatusOK</span>,
				<span style="color:#e6db74">&#34;error&#34;</span>: <span style="color:#e6db74">&#34;Welcome server 02&#34;</span>,
			},
		)
	})

	<span style="color:#66d9ef">return</span> <span style="color:#a6e22e">e</span>
}

<span style="color:#66d9ef">func</span> <span style="color:#a6e22e">main</span>() {
	<span style="color:#a6e22e">server01</span> <span style="color:#f92672">:=</span> <span style="color:#f92672">&amp;</span><span style="color:#a6e22e">http</span>.<span style="color:#a6e22e">Server</span>{
		<span style="color:#a6e22e">Addr</span>:         <span style="color:#e6db74">&#34;:8080&#34;</span>,
		<span style="color:#a6e22e">Handler</span>:      <span style="color:#a6e22e">router01</span>(),
		<span style="color:#a6e22e">ReadTimeout</span>:  <span style="color:#ae81ff">5</span> <span style="color:#f92672">*</span> <span style="color:#a6e22e">time</span>.<span style="color:#a6e22e">Second</span>,
		<span style="color:#a6e22e">WriteTimeout</span>: <span style="color:#ae81ff">10</span> <span style="color:#f92672">*</span> <span style="color:#a6e22e">time</span>.<span style="color:#a6e22e">Second</span>,
	}

	<span style="color:#a6e22e">server02</span> <span style="color:#f92672">:=</span> <span style="color:#f92672">&amp;</span><span style="color:#a6e22e">http</span>.<span style="color:#a6e22e">Server</span>{
		<span style="color:#a6e22e">Addr</span>:         <span style="color:#e6db74">&#34;:8081&#34;</span>,
		<span style="color:#a6e22e">Handler</span>:      <span style="color:#a6e22e">router02</span>(),
		<span style="color:#a6e22e">ReadTimeout</span>:  <span style="color:#ae81ff">5</span> <span style="color:#f92672">*</span> <span style="color:#a6e22e">time</span>.<span style="color:#a6e22e">Second</span>,
		<span style="color:#a6e22e">WriteTimeout</span>: <span style="color:#ae81ff">10</span> <span style="color:#f92672">*</span> <span style="color:#a6e22e">time</span>.<span style="color:#a6e22e">Second</span>,
	}
   <span style="color:#75715e">// 借助errgroup.Group或者自行开启两个goroutine分别启动两个服务
</span><span style="color:#75715e"></span>	<span style="color:#a6e22e">g</span>.<span style="color:#a6e22e">Go</span>(<span style="color:#66d9ef">func</span>() <span style="color:#66d9ef">error</span> {
		<span style="color:#66d9ef">return</span> <span style="color:#a6e22e">server01</span>.<span style="color:#a6e22e">ListenAndServe</span>()
	})

	<span style="color:#a6e22e">g</span>.<span style="color:#a6e22e">Go</span>(<span style="color:#66d9ef">func</span>() <span style="color:#66d9ef">error</span> {
		<span style="color:#66d9ef">return</span> <span style="color:#a6e22e">server02</span>.<span style="color:#a6e22e">ListenAndServe</span>()
	})

	<span style="color:#66d9ef">if</span> <span style="color:#a6e22e">err</span> <span style="color:#f92672">:=</span> <span style="color:#a6e22e">g</span>.<span style="color:#a6e22e">Wait</span>(); <span style="color:#a6e22e">err</span> <span style="color:#f92672">!=</span> <span style="color:#66d9ef">nil</span> {
		<span style="color:#a6e22e">log</span>.<span style="color:#a6e22e">Fatal</span>(<span style="color:#a6e22e">err</span>)
	}
}
</code></pre></div>
        </div>

        
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        <li><strong>原文作者：</strong><a rel="author" href="https://luckly.work/">luckly</a></li>
        <li style="word-break:break-all"><strong>原文链接：</strong><a href="https://luckly.work/post/go_gin/24%E4%B8%AD%E9%97%B4%E4%BB%B6/">https://luckly.work/post/go_gin/24%E4%B8%AD%E9%97%B4%E4%BB%B6/</a></li>
        <li><strong>版权声明：</strong>本作品采用<a rel="license" href="https://creativecommons.org/licenses/by-nc-nd/4.0/">知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议</a>进行许可，非商业转载请注明出处（作者，原文链接），商业转载请联系作者获得授权。</li>
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        <li><a href="/post/go_gin/06Gin%E6%A1%86%E6%9E%B6%E4%B8%AD%E4%BD%BF%E7%94%A8%E6%95%B0%E6%8D%AE%E5%BA%93/">Gin框架中使用数据库</a></li>
        
        <li><a href="/post/go_gin/16Gin%E6%B8%B2%E6%9F%93/">Gin渲染</a></li>
        
        <li><a href="/post/go_gin/05middleware%E7%9A%84%E7%BC%96%E5%86%99%E4%B8%8E%E4%BD%BF%E7%94%A8/">Gin的中间件</a></li>
        
        <li><a href="/post/go_gin/04%E4%BD%BF%E7%94%A8%E8%B7%AF%E7%94%B1%E7%BB%84%E5%88%86%E7%B1%BB%E5%A4%84%E7%90%86%E8%AF%B7%E6%B1%82/">Go语言基础之map</a></li>
        
        <li><a href="/post/go_gin/17restful%E6%9E%B6%E6%9E%84/">REST的含义</a></li>
        
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